Check the bobbin area to make sure the needle is not catching on something with the bobbin unit. Take the bobbin case out and see if it runs. It may be the belt but that's inside. Usually if the belt is off, the handwheel will turn easily but the needle will not go up and down. Suggest service by local authorized husqvarna viking dealer. You can find the nearest dealer from the husqvarna viking website and click on "Dealers" link. http://www.husqvarnaviking.com
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